Anomers

[Chocolatebear89]

For anomers, are beta always with -OH group UP on the anomeric carbon?

According to http://en.wikipedia.org/wiki/Anomer, the alpha α-L-arabinopyranose has the -OH group UP.

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[loveoforganic]

Strictly speaking, beta means cis to C-6 and alpha means trans.

 

[nUgnoY]

OH and the substituent on highest numbered carbon in the ring (probably CH2OH or CH2OPO3)

alpha: trans
beta: cis

For ex, if CH2OH is on top, then OH on top is cis
if CH2OH is on bottom, then OH on bottom is cis.